Another factory run using the same amounts of the same ingredients as those mentioned above except for a difierent grade of neoprene produced an Adhesive B which failed in the shear strength test at 1074 pounds per square inch while Adhesive A had a strength of 1385 pounds per square inch.Example 2 Two adhesives were made of ingredients present in the same ratio according to Example 1. Following are the formulations:<a href="http://www.lightcrusher.com/solutions/used-stone-crushing-machine.html">used stone crushing machine</a>,Adhesive A,Ingredients Pounds HR: sap gspsrogo U1 wow-or ocq Adhesive A has a 23% by weight solids content and Adhesive B has a 25% by weight solids content. The acetone-toluol solvent system used in Adhesive A was deliberately substituted for the more expensive methyl ethyl ketone. Adhesive A contains the unmilled neoprene and the ground mixture of solvent-resin-solids.
The dynamic shear strength test performed at room temperature showed that Adhesive B had a bond strength of 1319 pounds per square inch and Adhesive A had a bond strength of 1422 pounds per square inch,<a href="http://www.lightcrusher.com/solutions/trommel-for-alluvial-mining.html">trommel for alluvial mining</a>. Other properties such as the 90 peel strength test run in the Scott tester showed that Adhesive A had slightly but immaterially higher properties than Adhesive B.
Ex'ample 3 Into a container was placed 411 pounds of toluene, 351 pounds of an oil-soluble, heat-advancing phenol-formaldehyde resin (CKR-l634), 49 pounds of magnesium oxide, and one pound of water. The mixture was stirred for one hour at room temperature in order that the magnesium oxide would react with the resin; the slight excess of magnesium oxide remained suspended in the resin salt solution. Exactly 450 pounds of this resin salt solution along with 91 pounds of additional magnesium oxide, 78 pounds of finely-divided silicon dioxide (Hi Sil), and 39 pounds of zinc oxide were mixed and passed to a three-roll paint mill. The mixture was passed through the paint mill twice. Separately, 780 pounds of unmilled neoprene was dissolved in -a mixture of 1440 pounds of rubber solvent, 871 pounds methyl ethyl ketone, 661 pounds acetone, and 145 pounds of toluol. Stirring was maintained until all the unmilled neoprene dissolved in the solvent system.